It’s a day or two after the yeast was pitched in your most recent homebrew and there are signs of fermentation in the form of foam called krausen. A few days later, the rocky froth nearly fills the headspace of your fermenter as the yeast work through their busiest period, known as high-krausen.
German lager brewers traditionally took high-krausen wort from a newly fermenting batch and added it to a fully-fermented batch of the same recipe. This process, known as krausening, introduces healthy, new yeast to pick up where the primary yeast—which went dormant due to the layering temperatures—left off.
The Uses of Krausening
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